Table 1.

Characteristics and quality assessment of the included studies.

Study	Year	Country	Study design	Sample size		Total	MINORS score
				ERAS group	Control group
Kennedy et al.	2007	United States	Case-control study	91	44	135	15/24
Vanounou et al.	2007	United States	Case-control study	145	64	209	13/24
Balzano et al.	2008	Italy	Case-control study	252	252	504	15/24
Abu Hilal et al.	2013	Britain	Case-control study	20	24	44	14/24
Kobayashi et al.	2014	Japan	Case-control study	100	90	190	13/24
Braga et al.	2014	Italy	Case-control study	115	115	230	18/24
Coolsen et al.	2014	Netherlands	Case-control study	86	97	183	15/24
Shao et al.	2015	China	Case-control study	325	310	635	14/24
Sutcliffe et al.	2015	Britain	Case-control study	65	65	130	14/24
Williamsson et al.	2015	Sweden	Case-control study	50	50	100	16/24
Morales Soriano et al.	2015	Spain	Case-control study	41	44	85	16/24
Joliat et al.	2015	Switzerland	Case-control study	74	87	161	15/24
Bai et al.	2016	China	Case-control study	124	63	187	15/24
Zouros et al.	2016	Greece	Case-control study	75	50	125	16/24
Deng et al.	2017	China	RCT	76	83	159	∗
Su et al.	2017	China	Case-control study	31	31	62	15/24
Takagi et al.	2019	Japan	RCT	37	37	74	∗
Perinela et al.	2019	France	Case-control study	47	30	77	19/24
Lavu et al.	2019	United States	RCT	37	39	76	∗
Hwang et al.	2019	Korea	RCT	123	124	247	∗

RCT: randomized controlled trial; MINORS: methodological index for nonrandomized studies. ^∗Unconformity to MINORS score criteria.